#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This file is part of Beremiz runtime.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING.Runtime file for copyrights details.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.

# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

import sys
import traceback

from .Worker import worker

MainWorker = worker()

_PLCObjectSingleton = None


def GetPLCObjectSingleton():
    assert _PLCObjectSingleton is not None
    return _PLCObjectSingleton


def LogMessageAndException(msg, exp=None):
    """
    Args:
        msg:
        exp:
    """
    if exp is None:
        exp = sys.exc_info()
    if _PLCObjectSingleton is not None:
        _PLCObjectSingleton.LogMessage(0, msg + '\n'.join(traceback.format_exception(*exp)))
    print(msg)
    traceback.print_exception(*exp)


def CreatePLCObjectSingleton(*args, **kwargs):
    """
    Args:
        *args:
        **kwargs:
    """
    global _PLCObjectSingleton
    from runtime.PLCObject import PLCObject  # noqa # pylint: disable=wrong-import-position
    _PLCObjectSingleton = PLCObject(*args, **kwargs)


def default_evaluator(tocall, *args, **kwargs):
    """
    Args:
        tocall:
        *args:
        **kwargs:
    """
    try:
        res = (tocall(*args, **kwargs), None)
    except Exception:
        res = (None, sys.exc_info())
    return res
